Text.XML.HaXml.Xtract.Lex

Description

This is another hand-written lexer, this time for the Xtract command-language. The entry point is lexXtract. You don't normally need to use this module directly - the lexer is called automatically by the parser. (We only expose this interface for debugging purposes.)

The Xtract command language is very like the XPath specification.

Synopsis

lexXtract :: (String -> String) -> String -> [Token]

data Posn = Pn Int

data TokenT

= Symbol String

| TokString String

| TokNum Integer

type Token = Either String (Posn, TokenT)

Documentation

lexXtract :: (String -> String) -> String -> [Token]

Source

First argument is a transformer for pattern strings, e.g. map toLower, but only applying to parts of the pattern not in quotation marks. (Needed to canonicalise HTML where tags are case-insensitive, but attribute values are case sensitive.)

data Posn

Source

Constructors

Pn Int

Instances

Eq Posn

Show Posn

data TokenT

Source

Constructors

Symbol String
TokString String
TokNum Integer

Instances

Eq TokenT

Show TokenT

type Token = Either String (Posn, TokenT)

Source

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